orifice of nasolacrimal duct

例句：

1. 1.The scientist carefully examined the orifice of the pipe.
   科学家仔细检查了管道的开口。
2. 2.The animal's mouth was a perfect orifice for catching insects.
   动物的嘴巴是一个完美的开口，用来捕捉昆虫。
3. 3. The engineer designed an orifice that could regulate the flow of water.
   工程师设计了一个开口，可以调节水流。